Description
The Wheelock MT multitone horns and horn strobes offer a choice
of eight (8) nationally and internationally recognized alerting sounds:
Horn, Bell, March Time Horn, Code-3 Tone, Code-3 Horn, Slow
Whoop, Siren or Hi/Lo Tone. The Code-3 Horn and tone patterns
are engineered to comply with NFPA/ANSI Temporal Pattern
specifications without requiring additional equipment. With MT
horns and horn strobes, one alarm appliance meets most of your
signaling needs. The MT strobes can be synchronized using the
Wheelock DSM Sync Modules, Wheelock Power Supplies or other
manufacturers panel incorporating the Wheelock Patented Sync
Protocol. The MT’s Code 3 Horn may be sychronized with the same
equipment.
The MT Strobes are designed for ADA applications while meeting or
exceeding the latest requirements of NFPA 72, ANSI 117.1, UFC and
UL Standard 1971 as well as meeting ADA requirements concerning
photosensitive epilepsy.
Each MT appliance has two installer selective sound output levels:
STANDARD dBA and HIGH dBA. Non-strobe versions provide
selectable voltage capability in one unit, 12VDC or 24VDC. Strobe
versions are specific for either 12VDC or 24VDC and all models may
be used with filtered or unfiltered (full-wave-rectified) input voltages.
Separate input terminals and shunt wires are provided to enable both
audible and strobe to operate simultaneously from a single input.
The MT multitone strobe appliances are UL listed for indoor wall
mount applications under Standard 1971 for Signaling Devices for
the Hearing Impaired and under Standard 464 for Audible Signaling
Appliances. The MT horn strobe are also ULC listed under ULC-S525
Audible Signaling Devices for Fire Alarm and Signaling Systems,
including Accessories and ULC-S526 Visible Signal Devices, Fire
Alarm and Signaling Systems, including Accessories.
General Notes
• Strobes are designed to flash at 1 flash per second minimum over their
“Regulated Voltage Range.” Note that NFPA-72 specifies a flash rate of 1
to 2 flashes per second.
• All candela ratings represent minimum effective Strobe intensity based
on UL 1971.
Alarm Tones
Tones Alarm Tones Pattern Description
Drawings
Figure 1. MT Horn – Front & Side Views
Figure 2. MT Horn Strobe – Front & Side Views
Architects and Engineers Specifications
The notification appliance shall be a Wheelock Series MT audible/
visual appliance or equivalent. Notification appliance shall be
electronic and use solid state components. Electromechanical
alternatives are not approved. Each electronic appliance shall provide
eight (8) field selectable alarm tones. The tones shall consist of:
HORN, BELL, MARCH TIME HORN, CODE-3 HORN, CODE-3
TONE, SLOW WHOOP, SIREN and HI/LO. Tone selection shall be
by dip switch. The Multitone Audible appliance shall be UL Listed
under Standard 464 for Audible Signal Appliances. The audible and
the strobe shall be able to operate from a single NAC circuit while
producing any of these tones. The appliance shall provide two output
sound levels: STANDARD and HIGH dBA. The HIGH dBA setting shall
provide a typical 5 dBA increase in sound output at nominal voltage.
The HIGH anechoic dBA at 10 feet on the alarm HORN SETTING
shall be 99 dBA minimum. Operating voltages shall be either 12
VDC or 24 VDC using filtered power or unfiltered power supply (fullwave-rectified). All models shall have provisions for standard reverse
polarity type supervision and IN/OUT field wiring using terminals that
accept #12 to #18 AWG wiring.
Combination audible/visual appliances shall incorporate a Xenon
flashtube enclosed in a rugged Lexan® lens or equivalent with
solid state circuitry. Strobe shall produce a flash rate of one (1)
flash per second minimum over the voltage range. Strobe Models
shall incorporate circuitry for synchronized strobe flash and shall
be designed for compatibility with Wheelock DSM Sync Modules,
Wheelock Power Supplies or other manufacturers panels with built-in
Wheelock Patented Sync Protocol.
The strobes shall not drift out of synchronization at any time during
operation. If the module fails to operate (i.e., contacts remain closed),
the strobes shall revert to a non-synchronized default flash rate.
Strobe activation shall be via independent input or from the same
input circuit as the audible.
The combination audible/visual appliances shall be installed indoors
and may be surface or flush mounted. They shall mount to standard
electrical hardware requiring no additional trim plate or adapter. The
aesthetic appearance shall not have any mounting holes or screw
heads visible when the installation is completed. The appliance shall
be finished in a textured red color.
The Series MT-12/24, MTWP and MT4 appliances may be installed
indoor or outdoor with the proper back box.
UL, ULC, CSFM, FM, FCC
